The Azure WASB connector uses the same dynamic
read policy as the S3A “normal” policy: files are opened for
sequential IO, switching to random IO if the client application
starts to make random IO calls.

The Azure ADL connector always reads data in blocks of the byte size set by
the configuration option adl.feature.client.cache.readahead;
the default value is 4194304, that is, four megabytes.